I'm swapping back my to my standard oem 17 yamaha propellor, from mercury 15"- I did the actual swap last night, I seem to remember I could be wrong, does it require a thrust washer, before the prop goes on the spline or not please? its a 2stroke yamaha 60 longshaft, thanks guys, will I do any damage running without a thrust washer before the prop, as I'm geared up for a quick spin tonight to test out my steering,

it has a thrust washer after the prop, then a smaller washer, castle nut, then new split pin

On my 90 there are spacers/washers before and after the prop. The first (splined) spacer (thrust washer) goes behind the prop and has a rebate on the rear surface, then the prop, then splined (flat) spacer, then flat washer, then nut.

This setup is as shown in my workshop manual for all 2-stroke models 6-250hp

The thrust washer is the brass (usually) washer in front of the prop (with respect to the boat, that is; the nut will eventually be at the back); it is a machined part that butts against the taper on the prop shaft. Following that is the prop, then the spacer washer (the thick silver thingie); sometimes a flat washer, then the nut and pin.

I do not know for certain if your motor used used a thrust washer, but I do know that a prop nut kit does not contain a thrust washer, even if one is needed (for example my F115.)

The thrust washer is the brass (usually) washer in front of the prop (with respect to the boat, that is; the nut will eventually be at the back); it is a machined part that butts against the taper on the prop shaft. Following that is the prop, then the spacer washer (the thick silver thingie); sometimes a flat washer, then the nut and pin.

I do not know for certain if your motor used used a thrust washer, but I do know that a prop nut kit does not contain a thrust washer, even if one is needed (for example my F115.)